Post-Processing filters causing drop fps to 30-20 on high-end pc

[City300]

I've tried the same mods and PP filters on the pc of my friend, he gets 130+ FPS (We have pretty same pcs, except the ram, he have 8gb ram and I have 16gb)
Without PP I get same results, 80-140 fps, but if I turn on any PP (even default pp or b&w pp made by assetto corsa) the fps drops to 15-35
What can be the reason for it?
And also, for some reason Nvidia Geforce thinks that I'm playing Assetto Corsa with Oculus Rift and when im trying to optimize AC with Nvidia Geforce it sets VR in video settings.

 

[SquaggLand]

I am having the same issue, I have been unable to find a fix. I just built a new high-end PC and I was getting better frames with my 5 year old build then I do now. I do not have the VR issue. But as soon as I turn on PP it drops to anywhere from 15-39 depending on the track